
How to win Shipyard
A hackers guide to building an MVP that can win RevenueCat's Shipyard hackathon
Hi, I'm Perttu Lähteenlahti — a developer and designer based in Finland. I've spent the last decade designing and building digital products, from mobile apps to web platforms. I also won 20+ hackathons along the way.
Currently, I work as a Senior Developer Advocate at RevenueCat, where I help developers build and monetize their apps. My focus is on React Native, cross-platform development, and making in-app purchases less painful. You can read more about me, or see what I'm up to now.
I write practical, production-focused guides about React Native, iOS and Android development, mobile performance, and app monetization — especially subscriptions and in-app purchases. Most articles are based on real issues I've hit while building and shipping apps in production.





I write about React Native development, mobile app monetization, in-app purchases, and lessons learned from building products. Here are some of my recent posts.

A hackers guide to building an MVP that can win RevenueCat's Shipyard hackathon
Overengineered approach to tracking how many books I've read in 2026, with filtering, auto generated images, and progress bars

Learn how to monetize the app you created with Bolt using RevenueCat SDK and few lines of code.
A visual breakdown of my travel in 2025: 57 flights across 7 countries, from conferences in the US to quiet weeks in Finland.
How to make money with your Flutter app
FlutterKaigi 2025
Building & monetizing a React Native app for three platforms in 20 minutes
React Advanced London 2025
Why React Native apps make all the money
React Conf 2025




